CA2307395C - Tensioning unit - Google Patents
Tensioning unit Download PDFInfo
- Publication number
- CA2307395C CA2307395C CA002307395A CA2307395A CA2307395C CA 2307395 C CA2307395 C CA 2307395C CA 002307395 A CA002307395 A CA 002307395A CA 2307395 A CA2307395 A CA 2307395A CA 2307395 C CA2307395 C CA 2307395C
- Authority
- CA
- Canada
- Prior art keywords
- band
- tensioning
- guide part
- guide
- running direction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B13/00—Bundling articles
- B65B13/18—Details of, or auxiliary devices used in, bundling machines or bundling tools
- B65B13/22—Means for controlling tension of binding means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Basic Packing Technique (AREA)
Abstract
A tensioning unit 10 for a strapping machine serves for the tensioning and sealing of a band 18 guided around an item which is to be strapped. It has a tensioning head 20 and a housing 22 accommodating the same. The tensioning head 20 comprises a tensioning device 24 and a clamping and sealing subassembly 26.
Toward the end of a respective tensioning operation, it can be displaced relative to the housing 22 in a band-running direction B, which is counter to the tensioning direction S. Also provided in the housing 22 is a band guide 40 which is arranged downstream of the clamping and sealing member 26, as seen in the band-running direction B, and is subdivided into a front and a rear band-guide part 40' and 40", respectively. In this case, only the front band-guide part 40' can be displaced, together with the tensioning head 20, relative to the housing 22, whereas the rear band-guide part 40" can be moved away generally transversely to the band-running direction B by the front band-guide part 40', which is moved in the band-running direction B, preferably counter to a spring force.
Toward the end of a respective tensioning operation, it can be displaced relative to the housing 22 in a band-running direction B, which is counter to the tensioning direction S. Also provided in the housing 22 is a band guide 40 which is arranged downstream of the clamping and sealing member 26, as seen in the band-running direction B, and is subdivided into a front and a rear band-guide part 40' and 40", respectively. In this case, only the front band-guide part 40' can be displaced, together with the tensioning head 20, relative to the housing 22, whereas the rear band-guide part 40" can be moved away generally transversely to the band-running direction B by the front band-guide part 40', which is moved in the band-running direction B, preferably counter to a spring force.
Description
Tensioning unit The invention relates to a tensioning unit for a strapping machine for the tensioning and sealing of a band guided around an item which is to be strapped, having a tensioning head and a housing accommodating the same, it being the case that the tensioning head comprises a tensioning device and a clamping and sealing subassembly and, toward the end of a respective tensioning operation, can be displaced relative to the housing in a band-running direction, which is counter to the tensioning direction, and it being the case that provided in the housing is a band guide which is arranged downstream of the clamping and sealing member, as seen in the band-running direction.
By means of such a tensioning unit, the band is usually first of all introduced into a curved guide path element of the strapping machine and thus guided around the respective item which is to be strapped. The band end is then clamped firmly by means of the clamping and sealing member. Before the band is tensioned by the tensioning device, band guides provided are moved back to release the band. The band is then tensioned by the tensioning device, friction arising at the different corners of the item which is to be strapped. The decrease in the band tensioning, on account of this friction, from corner to corner of the item which is to be strapped means that, toward the end of the tensioning operation, the tensioning head is displaced, relative to the housing accommodating said tensioning head, in a band-running direction, which is counter to the tensioning direction, in order to ensure that the tensioning is regulated correspondingly. In this case, the item which is to be strapped is secured in relation to the housing, for which purpose the housing may be connected, for example, firmly to the curved guide path element of the strapping machine.
In the case of the hitherto conventional tensioning units, it is not just the band guide which is arranged downstream of the clamping and sealing member, as seen in the band-running direction, but also the entire rear band guide which is correspondingly displaced in the band-running direction, with the tensioning head, relative to the housing.
Since, with a respective movement of the tensioning head in this band-running direction, which is counter to the tensioning direction, the entire rear band guide is correspondingly displaced as well and this rear band guide correspondingly has to leave enough space in order to be able to pass out of the housing, the housing has to be provided with a corresponding through-passage. For this purpose, corresponding intervention in the curved band-guide path element, which adjoins the housing, is also necessary.
The object of the invention is to provide a tensioning unit of the type mentioned in the introduction in which it is possible to dispense with the hitherto necessary through-passages in the housing and which can thus be installed without any intervention in the adjacent components being necessary.
This object is achieved according to the invention in that the band guide which is arranged downstream of the clamping and sealing member is subdivided into a front and a rear band-guide part, in that only the front band-guide part can be displaced, together with the tensioning head, relative to the housing, and in that the rear band-guide part can be moved away generally transversely to the band-running direction by the front band-guide part, which is moved in the band-running direction, preferably counter to a spring force.
With a respective displacement of the tensioning head, the rear band-guide part is thus displaced away within the housing, generally transversely to the band-running direction, by the front band-guide part, as a result of which enough space is provided within the housing for the movement of the front band-guide part. The rear band-guide part does not move along with the tensioning head in the band-running direction. There is thus no longer any need for any through-passages in the housing. The tensioning unit can be installed in the relevant strapping machine without any intervention in the adjacent components being necessary. This is advantageous, in particular, for installation in existing machines.
The front and the rear band-guide parts may be provided, in particular, with interacting sloping surfaces via which the rear band-guide part is correspondingly displaced away. If the tensioning head, thus the front band-guide part, is displaced in the band-running direction, then the rear band-guide part slides, by way of its sloping surface, along the sloping surface of the front band-guide part, for example, in the outward direction, as a result of which a corresponding amount of space is provided for the front band-guide part.
In the case of an expedient practical embodiment of the tensioning unit according to the invention, the rear band-guide part is mounted such that it can be pivoted about an inner spindle, supported on the housing, and is forced into its band-guiding position by a spring force. If the band is to be released for the tensioning operation, then the rear, band-guide part can be correspondingly deflected counter to the spring force. If, toward the end of the tensioning operation, the tensioning head is then displaced in the band-running direction, said rear band-guide part can additionally be deflected counter to the spring force in order to provide enough space for the front band-guide part. The relevant pivot spindle preferably extends generally parallel to the band-running direction.
The rear band-guide part, which is preferably arranged at a free end of a pivot lever, may be provided, in particular, with a band-guide slit. As soon as said band-guide part is pivoted out of its band-guiding position, the band can pass out of the guide slit.
In a preferred practical embodiment of the tensioning unit according to the invention, the front band-guide part can be driven for a respective release of the band, while the rear band-guide part is correspondingly carried along by the front band-guide part. The rear band-guide part thus already has the front band-guide part correspondingly acting on it for a respective band release.
It is possible for the front band-guide part to be mounted such that it can be pivoted, for example, about a spindle, and to be forced into its band-guiding position by a spring force. Once again, it is expedient for the pivot spindle generally to extend parallel to the band-running direction.
It is also the case that the front band-guide part, which is preferably arranged at a free end of a pivot lever, is expediently provided, once again, with a band-guide slit. The latter is expediently aligned with the guide slit of the rear band-guide part. If, then, the rear band-guide part is carried along, for example, by the front band-guide part for a respective release of the band, and is correspondingly pivoted with said front band-guide part, then the band is released simultaneously from both slits.
In an expedient practical embodiment of the tensioning unit according to the invention, the front band-guide part, which is preferably provided with a band-guide slit, is arranged at a free end of a two armed pivot lever, at the other free end of which there is provided a follow-on roller interacting with a cam plate. In this case, it is possible for the pivot lever, once again, to be forced into the band-guiding position by a spring force.
It is customary for the tensioning head also to comprise.~a band guide which is arranged upstream of the - S -clamping and sealing member, as seen in the band-running direction. Such a front band guide may then also preferably be moved out of its band-guiding position again for a respective release of the band.
The invention is explained in more detail hereinbelow, by way of an exemplary embodiment, with reference to the drawing, in which:
Figure 1 shows a schematic side view of a strapping machine provided with a tensioning unit according to the invention, Figure 2 shows a schematic plan view of the tensioning unit in which the tensioning head is illustrated in its starting position and the band guides are each in their band-guiding position, Figure 3 shows a schematic plan view of the tensioning unit in which the tensioning head is still in its starting position, but the band guides have already been moved out of their respective band-guiding position, Figure 4 shows a schematic plan view of the tensioning unit in which the tensioning head has already been moved out of its starting position in the band-running direction, which is counter to the tensioning direction, and the rear band-guide part has correspondingly also been displaced away in the outward direction by the front band-guide part of the rear band guide, Figure 5 shows a schematic side view of the front band-guide part assigned to the rear band guide, as seen in the band-running direction, Figure 6 shows a schematic front view of the front band-guide part, Figure 7 shows a schematic side view of the rear band-guide part assigned to the rear band guide, as seen in the band-running direction, Figure 8 shows a schematic front view of the rear band-guide part, and Figure 9 shows a schematic diagram of the functioning of the tensioning unit during the tensioning operation.
Figure 1 shows a purely schematic side view of a strapping machine 12 which is provided with a tensioning unit 10 according to the invention and has a curved guide path element 16 surrounding the respective item which is to be strapped 14.
The tensioning unit serves for the tensioning and sealing of a band 18 which is guided around the item which is to be strapped 14 and may be, for example, a plastic band. The tensioning unit 10 has a tensioning head 20 and a housing 22 which accommodates the same and, in the present case is supported on the curved guide path element 16. The item which is to be strapped 14, and is surrounded by the curved guide path element 16, is secured in its position in relation to the housing 22 of the tensioning unit 10.
The tensioning head 20 comprises a tensioning device 24 and a clamping and sealing subassembly 26. In this case, the tensioning device 24 serves, in particular, for the final tensioning of the band 18.
Arranged between the tensioning device 24 and the clamping and sealing subassembly 26 is a pair of conveying rollers 28 connected to a reversible drive.
The band 18, which is fed from an unwinding means 30 via a band-guide unit 31 and is guided through the tensioning device 24, is intended to be fed by said pair of conveying rollers 28 in a band-running direction B, which is counter to the tensioning direction S, through the clamping and sealing subassembly 26 and into the curved guide path element 16, with the free band end 18' in front, until the band end 18' butts against a stop in the clamping and sealing subassembly 26. The curved guide path element 16 runs around the item which is to be strapped 14. The band 18, which is guided around the item which is to be strapped 14 and is clamped firmly, by means of a first band clamp 32 of the clamping and sealing subassembly _ 7 _ 26, at a distance from the band end 18' butting against said stop, is also intended to be drawn back in the tensioning direction S by means of the pair of conveying rollers 28 until it is positioned at least essentially on the item which is to be strapped 14.
The clamping and sealing subassembly 26 has a second band clamp 34 and, between the two band clamps 32, 34, a welding unit 36 (see in particular, Figures 2 to 4), which may be provided, for example, with a welding tongue or the like.
Once the pair of conveying rollers has drawn back the band 18 in the tensioning direction S and said band has positioned itself on the item which is to be strapped 14, the tensioning device 24 comes into operation, as a result of which the band 18 is gripped and tensioned to the predetermined tensioning force.
As can be seen from the schematic diagram according to Figure 9, the tensioning of the band 18 causes friction to arise at each corner of the item which is to be strapped 14. The band tensioning decreases from the corner a, via the corners b and c, to the corner d of the item which is to be strapped 14.
In order, then, to ensure that the tensioning is regulated correspondingly, toward the end of a respective tensioning operation, the tensioning head 20 is displaced to the left relative to the housing 22 in the band-running direction B, which is counter to the tensioning direction S, with the band end 18' clamped firmly. In this case, the tensioning head 20 is guided by the housing-mounted guides 37 which can be seen in Figures 2 to 4.
Following this, the clamping and sealing subassembly 26 comes into operation by the second band clamp 34 clamping the band 18 firmly and the welding unit 36 (see Figures 2 to 4) welding the two overlapping sections of the band 18 to one another by heating and clamping. Thereafter, by means of the band 18 is severed downstream of the welding location, as -seen in the tensioning direction S the clamping and sealing subassembly 26.
As can be seen, in particular, from Figures 2 to 4, the tensioning head 20 comprises a band guide 38 which is arranged upstream of the clamping and sealing member 26, as seen in the band-running direction B, and can be displaced together with the tensioning head 20, relative to the housing 22.
Also provided in the housing 22 is a band guide 40 which is arranged downstream of the clamping and sealing member 26, as seen in the band-running direction B.
As can best be seen, once again, from Figures 2 to 4, the band guide 40, which is arranged downstream of the clamping and sealing member 26, is subdivided into a front and rear band-guide part 40' and 40", respectively, as seen in the band-running direction B.
In this case, only the front band-guide part 40' can be displaced, together with the tensioning head 20, relative to the housing 22. In contrast, the rear band-guide part 40" is displaced away generally transversely to the band-running direction B (see in particular, Figure 4) by the front band-guide part 40', which is moved in the band-running direction B, counter to the force of a restoring spring 42 (see Figure 7). As can be seen from Figure 4, the rear band-guide part 40" is displaced away in this manner once the band 18 has already been released. This means that the rear band-guide part 40" is moved even further outward, downward in Figure 4, by respective displacement of the tensioning head 20 than has already been the case with the preceding release of the band 18. The essential factor is thus that the rear band-guide part 40" is displaced transversely to the band-running direction B
relative to the front band-guide part 40', with the result that enough space for the movement of the front band-guide part 40' is provided within the housing 22.
The rear band-guide part 40" thus does not move along the tensioning head 20 in the band-running direction B.
- g -Accordingly, there is also no longer any need for any through-passages in the housing 22, which means that the tensioning unit 10 can be installed in the.
strapping machine 12 without any intervention in the adjacent components, for example the curved guide path element 16, being necessary. This is advantageous, in particular, for installation in existing machines.
In the present case, the front and the rear band-guide parts 40' and 40", respectively, are provided with interacting sloping surfaces 44, 46 via which the rear band-guide part 40" is correspondingly displaced outward in the manner illustrated in Figure 4.
In the present exemplary embodiment, the rear band-guide part 40" is mounted such that it can be pivoted about an inner spindle 48 which is supported on the housing 22 and generally extends parallel to the band-running direction B (see, in particular, figures 7 and 8). In this case, said rear band-guide part 40", which is arranged at the free end of a pivot lever 50, is provided with a band-guide slit 52. The restoring spring 42 is arranged between the housing 22 and the pivot lever 50. Said restoring spring 42 forces the pivot lever 50 into the band-guiding position, in which the band 18 is accommodated in the guide slit 52. As can be seen from Figure 7, the rear band-guide part 40"
can then be correspondingly pivoted counter to the force the restoring spring 42 in order to release the band 18 and/or, furthermore, in order to release the displacement path for the front band-guide part 40'.
The front band-guide part 40' can be driven for a respective release of the band 18, whereas the rear band-guide part 40" is correspondingly carried along by the front band-guide part 40' (see, in particular, Figures 2 and 3).
As can best be seen from Figures 5 and 6, the front band-guide part 40' is mounted such that it can be pivoted about a spindle 54 and is forced into its band-guiding position by the force of a restoring spring 56. The pivot spindle 54 runs, once again, generally parallel to the band-running direction B.
In the present exemplary embodiment, the front band-guide part 40', which is provided with a band s guide slit 58, is arranged at a free end of a two-armed pivot lever 60, at the other free end of which there is provided a follow-on roller 64 interacting with a cam plate 62 (see, in particular, Figures 5 and 6).
For a respective release of the band 18, the pivot lever 60 is thus correspondingly pivoted via the cam plate 62, whereupon the band 18 passes out of the guide slit 58 of the front band-guide part 40', which is assigned to said pivot lever 60. The rear band-guide part 40" is carried along by the front band-guide part 40', with the result that, as the front band-guide part 40' is pivoted out of the band-guiding position, the rear band-guide part 40" is correspondingly pivoted as well and, at the same time, the band 18 also passes out of the band-guide slit 52 of said rear band-guide part 40".
The front band guide 38 may also be moved out of its band-guiding position for a respective release of the band 18.
By means of such a tensioning unit, the band is usually first of all introduced into a curved guide path element of the strapping machine and thus guided around the respective item which is to be strapped. The band end is then clamped firmly by means of the clamping and sealing member. Before the band is tensioned by the tensioning device, band guides provided are moved back to release the band. The band is then tensioned by the tensioning device, friction arising at the different corners of the item which is to be strapped. The decrease in the band tensioning, on account of this friction, from corner to corner of the item which is to be strapped means that, toward the end of the tensioning operation, the tensioning head is displaced, relative to the housing accommodating said tensioning head, in a band-running direction, which is counter to the tensioning direction, in order to ensure that the tensioning is regulated correspondingly. In this case, the item which is to be strapped is secured in relation to the housing, for which purpose the housing may be connected, for example, firmly to the curved guide path element of the strapping machine.
In the case of the hitherto conventional tensioning units, it is not just the band guide which is arranged downstream of the clamping and sealing member, as seen in the band-running direction, but also the entire rear band guide which is correspondingly displaced in the band-running direction, with the tensioning head, relative to the housing.
Since, with a respective movement of the tensioning head in this band-running direction, which is counter to the tensioning direction, the entire rear band guide is correspondingly displaced as well and this rear band guide correspondingly has to leave enough space in order to be able to pass out of the housing, the housing has to be provided with a corresponding through-passage. For this purpose, corresponding intervention in the curved band-guide path element, which adjoins the housing, is also necessary.
The object of the invention is to provide a tensioning unit of the type mentioned in the introduction in which it is possible to dispense with the hitherto necessary through-passages in the housing and which can thus be installed without any intervention in the adjacent components being necessary.
This object is achieved according to the invention in that the band guide which is arranged downstream of the clamping and sealing member is subdivided into a front and a rear band-guide part, in that only the front band-guide part can be displaced, together with the tensioning head, relative to the housing, and in that the rear band-guide part can be moved away generally transversely to the band-running direction by the front band-guide part, which is moved in the band-running direction, preferably counter to a spring force.
With a respective displacement of the tensioning head, the rear band-guide part is thus displaced away within the housing, generally transversely to the band-running direction, by the front band-guide part, as a result of which enough space is provided within the housing for the movement of the front band-guide part. The rear band-guide part does not move along with the tensioning head in the band-running direction. There is thus no longer any need for any through-passages in the housing. The tensioning unit can be installed in the relevant strapping machine without any intervention in the adjacent components being necessary. This is advantageous, in particular, for installation in existing machines.
The front and the rear band-guide parts may be provided, in particular, with interacting sloping surfaces via which the rear band-guide part is correspondingly displaced away. If the tensioning head, thus the front band-guide part, is displaced in the band-running direction, then the rear band-guide part slides, by way of its sloping surface, along the sloping surface of the front band-guide part, for example, in the outward direction, as a result of which a corresponding amount of space is provided for the front band-guide part.
In the case of an expedient practical embodiment of the tensioning unit according to the invention, the rear band-guide part is mounted such that it can be pivoted about an inner spindle, supported on the housing, and is forced into its band-guiding position by a spring force. If the band is to be released for the tensioning operation, then the rear, band-guide part can be correspondingly deflected counter to the spring force. If, toward the end of the tensioning operation, the tensioning head is then displaced in the band-running direction, said rear band-guide part can additionally be deflected counter to the spring force in order to provide enough space for the front band-guide part. The relevant pivot spindle preferably extends generally parallel to the band-running direction.
The rear band-guide part, which is preferably arranged at a free end of a pivot lever, may be provided, in particular, with a band-guide slit. As soon as said band-guide part is pivoted out of its band-guiding position, the band can pass out of the guide slit.
In a preferred practical embodiment of the tensioning unit according to the invention, the front band-guide part can be driven for a respective release of the band, while the rear band-guide part is correspondingly carried along by the front band-guide part. The rear band-guide part thus already has the front band-guide part correspondingly acting on it for a respective band release.
It is possible for the front band-guide part to be mounted such that it can be pivoted, for example, about a spindle, and to be forced into its band-guiding position by a spring force. Once again, it is expedient for the pivot spindle generally to extend parallel to the band-running direction.
It is also the case that the front band-guide part, which is preferably arranged at a free end of a pivot lever, is expediently provided, once again, with a band-guide slit. The latter is expediently aligned with the guide slit of the rear band-guide part. If, then, the rear band-guide part is carried along, for example, by the front band-guide part for a respective release of the band, and is correspondingly pivoted with said front band-guide part, then the band is released simultaneously from both slits.
In an expedient practical embodiment of the tensioning unit according to the invention, the front band-guide part, which is preferably provided with a band-guide slit, is arranged at a free end of a two armed pivot lever, at the other free end of which there is provided a follow-on roller interacting with a cam plate. In this case, it is possible for the pivot lever, once again, to be forced into the band-guiding position by a spring force.
It is customary for the tensioning head also to comprise.~a band guide which is arranged upstream of the - S -clamping and sealing member, as seen in the band-running direction. Such a front band guide may then also preferably be moved out of its band-guiding position again for a respective release of the band.
The invention is explained in more detail hereinbelow, by way of an exemplary embodiment, with reference to the drawing, in which:
Figure 1 shows a schematic side view of a strapping machine provided with a tensioning unit according to the invention, Figure 2 shows a schematic plan view of the tensioning unit in which the tensioning head is illustrated in its starting position and the band guides are each in their band-guiding position, Figure 3 shows a schematic plan view of the tensioning unit in which the tensioning head is still in its starting position, but the band guides have already been moved out of their respective band-guiding position, Figure 4 shows a schematic plan view of the tensioning unit in which the tensioning head has already been moved out of its starting position in the band-running direction, which is counter to the tensioning direction, and the rear band-guide part has correspondingly also been displaced away in the outward direction by the front band-guide part of the rear band guide, Figure 5 shows a schematic side view of the front band-guide part assigned to the rear band guide, as seen in the band-running direction, Figure 6 shows a schematic front view of the front band-guide part, Figure 7 shows a schematic side view of the rear band-guide part assigned to the rear band guide, as seen in the band-running direction, Figure 8 shows a schematic front view of the rear band-guide part, and Figure 9 shows a schematic diagram of the functioning of the tensioning unit during the tensioning operation.
Figure 1 shows a purely schematic side view of a strapping machine 12 which is provided with a tensioning unit 10 according to the invention and has a curved guide path element 16 surrounding the respective item which is to be strapped 14.
The tensioning unit serves for the tensioning and sealing of a band 18 which is guided around the item which is to be strapped 14 and may be, for example, a plastic band. The tensioning unit 10 has a tensioning head 20 and a housing 22 which accommodates the same and, in the present case is supported on the curved guide path element 16. The item which is to be strapped 14, and is surrounded by the curved guide path element 16, is secured in its position in relation to the housing 22 of the tensioning unit 10.
The tensioning head 20 comprises a tensioning device 24 and a clamping and sealing subassembly 26. In this case, the tensioning device 24 serves, in particular, for the final tensioning of the band 18.
Arranged between the tensioning device 24 and the clamping and sealing subassembly 26 is a pair of conveying rollers 28 connected to a reversible drive.
The band 18, which is fed from an unwinding means 30 via a band-guide unit 31 and is guided through the tensioning device 24, is intended to be fed by said pair of conveying rollers 28 in a band-running direction B, which is counter to the tensioning direction S, through the clamping and sealing subassembly 26 and into the curved guide path element 16, with the free band end 18' in front, until the band end 18' butts against a stop in the clamping and sealing subassembly 26. The curved guide path element 16 runs around the item which is to be strapped 14. The band 18, which is guided around the item which is to be strapped 14 and is clamped firmly, by means of a first band clamp 32 of the clamping and sealing subassembly _ 7 _ 26, at a distance from the band end 18' butting against said stop, is also intended to be drawn back in the tensioning direction S by means of the pair of conveying rollers 28 until it is positioned at least essentially on the item which is to be strapped 14.
The clamping and sealing subassembly 26 has a second band clamp 34 and, between the two band clamps 32, 34, a welding unit 36 (see in particular, Figures 2 to 4), which may be provided, for example, with a welding tongue or the like.
Once the pair of conveying rollers has drawn back the band 18 in the tensioning direction S and said band has positioned itself on the item which is to be strapped 14, the tensioning device 24 comes into operation, as a result of which the band 18 is gripped and tensioned to the predetermined tensioning force.
As can be seen from the schematic diagram according to Figure 9, the tensioning of the band 18 causes friction to arise at each corner of the item which is to be strapped 14. The band tensioning decreases from the corner a, via the corners b and c, to the corner d of the item which is to be strapped 14.
In order, then, to ensure that the tensioning is regulated correspondingly, toward the end of a respective tensioning operation, the tensioning head 20 is displaced to the left relative to the housing 22 in the band-running direction B, which is counter to the tensioning direction S, with the band end 18' clamped firmly. In this case, the tensioning head 20 is guided by the housing-mounted guides 37 which can be seen in Figures 2 to 4.
Following this, the clamping and sealing subassembly 26 comes into operation by the second band clamp 34 clamping the band 18 firmly and the welding unit 36 (see Figures 2 to 4) welding the two overlapping sections of the band 18 to one another by heating and clamping. Thereafter, by means of the band 18 is severed downstream of the welding location, as -seen in the tensioning direction S the clamping and sealing subassembly 26.
As can be seen, in particular, from Figures 2 to 4, the tensioning head 20 comprises a band guide 38 which is arranged upstream of the clamping and sealing member 26, as seen in the band-running direction B, and can be displaced together with the tensioning head 20, relative to the housing 22.
Also provided in the housing 22 is a band guide 40 which is arranged downstream of the clamping and sealing member 26, as seen in the band-running direction B.
As can best be seen, once again, from Figures 2 to 4, the band guide 40, which is arranged downstream of the clamping and sealing member 26, is subdivided into a front and rear band-guide part 40' and 40", respectively, as seen in the band-running direction B.
In this case, only the front band-guide part 40' can be displaced, together with the tensioning head 20, relative to the housing 22. In contrast, the rear band-guide part 40" is displaced away generally transversely to the band-running direction B (see in particular, Figure 4) by the front band-guide part 40', which is moved in the band-running direction B, counter to the force of a restoring spring 42 (see Figure 7). As can be seen from Figure 4, the rear band-guide part 40" is displaced away in this manner once the band 18 has already been released. This means that the rear band-guide part 40" is moved even further outward, downward in Figure 4, by respective displacement of the tensioning head 20 than has already been the case with the preceding release of the band 18. The essential factor is thus that the rear band-guide part 40" is displaced transversely to the band-running direction B
relative to the front band-guide part 40', with the result that enough space for the movement of the front band-guide part 40' is provided within the housing 22.
The rear band-guide part 40" thus does not move along the tensioning head 20 in the band-running direction B.
- g -Accordingly, there is also no longer any need for any through-passages in the housing 22, which means that the tensioning unit 10 can be installed in the.
strapping machine 12 without any intervention in the adjacent components, for example the curved guide path element 16, being necessary. This is advantageous, in particular, for installation in existing machines.
In the present case, the front and the rear band-guide parts 40' and 40", respectively, are provided with interacting sloping surfaces 44, 46 via which the rear band-guide part 40" is correspondingly displaced outward in the manner illustrated in Figure 4.
In the present exemplary embodiment, the rear band-guide part 40" is mounted such that it can be pivoted about an inner spindle 48 which is supported on the housing 22 and generally extends parallel to the band-running direction B (see, in particular, figures 7 and 8). In this case, said rear band-guide part 40", which is arranged at the free end of a pivot lever 50, is provided with a band-guide slit 52. The restoring spring 42 is arranged between the housing 22 and the pivot lever 50. Said restoring spring 42 forces the pivot lever 50 into the band-guiding position, in which the band 18 is accommodated in the guide slit 52. As can be seen from Figure 7, the rear band-guide part 40"
can then be correspondingly pivoted counter to the force the restoring spring 42 in order to release the band 18 and/or, furthermore, in order to release the displacement path for the front band-guide part 40'.
The front band-guide part 40' can be driven for a respective release of the band 18, whereas the rear band-guide part 40" is correspondingly carried along by the front band-guide part 40' (see, in particular, Figures 2 and 3).
As can best be seen from Figures 5 and 6, the front band-guide part 40' is mounted such that it can be pivoted about a spindle 54 and is forced into its band-guiding position by the force of a restoring spring 56. The pivot spindle 54 runs, once again, generally parallel to the band-running direction B.
In the present exemplary embodiment, the front band-guide part 40', which is provided with a band s guide slit 58, is arranged at a free end of a two-armed pivot lever 60, at the other free end of which there is provided a follow-on roller 64 interacting with a cam plate 62 (see, in particular, Figures 5 and 6).
For a respective release of the band 18, the pivot lever 60 is thus correspondingly pivoted via the cam plate 62, whereupon the band 18 passes out of the guide slit 58 of the front band-guide part 40', which is assigned to said pivot lever 60. The rear band-guide part 40" is carried along by the front band-guide part 40', with the result that, as the front band-guide part 40' is pivoted out of the band-guiding position, the rear band-guide part 40" is correspondingly pivoted as well and, at the same time, the band 18 also passes out of the band-guide slit 52 of said rear band-guide part 40".
The front band guide 38 may also be moved out of its band-guiding position for a respective release of the band 18.
Claims (16)
1. A tensioning unit for a strapping machine for the tensioning and sealing of a band guided around an item which is to be strapped, having a tensioning head and a housing accommodating the same, the tensioning head comprising a tensioning device and a clamping and sealing subassembly and, toward the end of a respective tensioning operation, can be displaced relative to the housing in a band-running direction, which is counter to the tensioning direction, and provided in the housing being a band guide which is arranged downstream of the clamping and sealing member as seen in the band-running direction, wherein the band guide, which is arranged downstream of the clamping and sealing member, is subdivided into a front and a rear band-guide part, wherein only the front band-guide part can be displaced, together with the tensioning head, relative to the housing, and wherein the rear band-guide part can be moved away generally transversely to the band-running direction by the front band-guide part, which is moved in the band-running direction.
2. The tensioning unit as claimed in claim 1, wherein the rear band-guide part can be moved away generally transversely to the band-running direction by the front band-guide part, counter to a spring force.
3. The tensioning unit as claimed in claim 1 or 2, wherein the front and the rear band-guide parts are provided with interacting sloping surfaces via which the rear band-guide part is correspondingly displaced away.
4. The tensioning unit as claimed in any one of claims 1 to 3, wherein the rear band-guide part is mounted such that it can be pivoted about an inner spindle, supported on the housing, and is forced into its band-guiding position by a spring force.
5. The tensioning unit as claimed in claim 4, wherein the pivot spindle generally extends parallel to the band-running direction.
6. The tensioning unit as claimed in any one of claims 1 to 5, wherein the rear band-guide part is provided with a band-guide slit.
7. The tensioning unit as claimed in claim 6, wherein the rear band-guide part is arranged at a front end of a pivot lever.
8. The tensioning unit as claimed in any one of claims 1 to 7, wherein the front band-guide part can be driven for a respective release of the band, and the rear band-guide part is correspondingly carried along by the front band-guide part.
9. The tensioning unit as claimed in any one of claims 1 to 8, wherein the front band-guide part is mounted such that it can be pivoted about a spindle, and is forced into its band-guiding position by a spring force.
10. The tensioning unit as claimed in claim 9, wherein the pivot spindle generally extends parallel to the band-running direction.
11. The tensioning unit as claimed in any one of claims 1 to 10, wherein the front band-guide part is provided with a band-guide slit.
12. The tensioning unit as claimed claim 11, wherein the front band-guide part is arranged at a free end of a pivot lever.
13. The tensioning unit as claimed in any one of claims 1 to 12, wherein the front band-guide part is arranged at a free end of a two-armed pivot lever, at the other free end of which there is provided a follow-on roller interacting with a cam plate.
14. The tensioning unit as claimed in claim 13, wherein the front band-guide part is provided with a band-guide slit.
15. The tensioning unit as claimed in any one of claims 1 to 14, wherein the tensioning head also comprises a band guide which is arranged upstream of the clamping and sealing member, as seen in the band-running direction.
16. The tensioning unit as claimed in claim 15, wherein the front band guide can be moved out of its band-guiding position for a respective release of the band.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19920725.9 | 1999-05-05 | ||
| DE19920725A DE19920725B4 (en) | 1999-05-05 | 1999-05-05 | clamping unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2307395A1 CA2307395A1 (en) | 2000-11-05 |
| CA2307395C true CA2307395C (en) | 2006-09-12 |
Family
ID=7907083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002307395A Expired - Fee Related CA2307395C (en) | 1999-05-05 | 2000-05-02 | Tensioning unit |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6568317B1 (en) |
| EP (1) | EP1050462B1 (en) |
| AT (1) | ATE254564T1 (en) |
| CA (1) | CA2307395C (en) |
| DE (2) | DE19920725B4 (en) |
| ES (1) | ES2209711T3 (en) |
| TW (1) | TW464626B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10323153B4 (en) * | 2003-05-22 | 2006-12-07 | Helmut Schmetzer | Welding head for a band strapping machine and strapping machine |
| FR2911322B1 (en) | 2007-01-11 | 2012-08-10 | Clayrton S | PROCESS FOR THE PREPARATION OF PACKAGES OF FLORAL AND / OR VEGETABLE COMPOSITIONS |
| US7377213B1 (en) * | 2007-09-07 | 2008-05-27 | Illinois Tool Works Inc. | Strapping machine with improved tension, seal and feed arrangement |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1176753A (en) * | 1956-06-21 | 1959-04-15 | Conditioning apparatus, in particular for the heat treatment of parts | |
| FR1176752A (en) | 1956-07-04 | 1959-04-15 | Seal Less Strapping Ltd | Mechanism for forming a strapping loop around packages |
| DE1157538B (en) * | 1961-07-03 | 1963-11-14 | Siegfried Guenther Rhode | Tying machine |
| US3179037A (en) * | 1961-11-27 | 1965-04-20 | Warrenton Marine Services Inc | Preformed loop type binding machine |
| JPS5121998A (en) * | 1974-08-15 | 1976-02-21 | Nichiro Kogyo Kk | Jidokonhokiniokeru bandoannaisochi |
| US4575994A (en) * | 1983-12-05 | 1986-03-18 | Shoko Kiko Co., Ltd. | Package strapping machine |
| DE3661514D1 (en) * | 1985-11-06 | 1989-02-02 | Strapex Ag | Device for encircling an object with a strap |
| US4724659A (en) * | 1985-12-24 | 1988-02-16 | Nichiro Kogyo Company Ltd. | Band type strapping machine |
| US4912908A (en) * | 1987-06-04 | 1990-04-03 | Strapack Corporation | Band tightening apparatus in a strapping machine |
| CA1320427C (en) * | 1987-06-18 | 1993-07-20 | Yasunori Sakaki | Method and apparatus for feeding and tightening a band in strapping machine |
| JPH0311129Y2 (en) * | 1987-07-08 | 1991-03-19 | ||
| TW226355B (en) | 1992-05-19 | 1994-07-11 | Strapex Holding Ag | |
| JP2857281B2 (en) * | 1992-07-10 | 1999-02-17 | ストラパック株式会社 | Band loading device in packing machine |
| JPH0740917A (en) * | 1993-07-21 | 1995-02-10 | Kioritz Corp | Packing apparatus |
| DE4416013A1 (en) * | 1994-05-06 | 1995-11-09 | Georg Lang | Device for strapping a packaged product |
| TW316885B (en) * | 1995-02-03 | 1997-10-01 | Nichiro Kogyo Kk | |
| DE19652103A1 (en) | 1996-12-14 | 1998-06-18 | Signode Bernpak Gmbh | Device for strapping packages |
| CH692612A5 (en) | 1998-03-09 | 2002-08-30 | Strapex Holding Ag | Belt tensioning device to a strapping machine. |
-
1999
- 1999-05-05 DE DE19920725A patent/DE19920725B4/en not_active Expired - Fee Related
-
2000
- 2000-04-12 US US09/548,353 patent/US6568317B1/en not_active Expired - Fee Related
- 2000-04-17 DE DE50004474T patent/DE50004474D1/en not_active Expired - Fee Related
- 2000-04-17 AT AT00107954T patent/ATE254564T1/en not_active IP Right Cessation
- 2000-04-17 ES ES00107954T patent/ES2209711T3/en not_active Expired - Lifetime
- 2000-04-17 EP EP00107954A patent/EP1050462B1/en not_active Expired - Lifetime
- 2000-04-28 TW TW089108105A patent/TW464626B/en not_active IP Right Cessation
- 2000-05-02 CA CA002307395A patent/CA2307395C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE19920725B4 (en) | 2004-08-26 |
| DE50004474D1 (en) | 2003-12-24 |
| ES2209711T3 (en) | 2004-07-01 |
| DE19920725A1 (en) | 2000-11-16 |
| US6568317B1 (en) | 2003-05-27 |
| EP1050462A3 (en) | 2002-09-18 |
| EP1050462B1 (en) | 2003-11-19 |
| TW464626B (en) | 2001-11-21 |
| CA2307395A1 (en) | 2000-11-05 |
| EP1050462A2 (en) | 2000-11-08 |
| ATE254564T1 (en) | 2003-12-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2032926C (en) | Binding machine, such as strapping machine | |
| EP0472245B1 (en) | Apparatus for continuously unwinding a plurality of rolled-up tapes | |
| US8327758B2 (en) | Tape strapping machine | |
| US20050188861A1 (en) | Strapping of bank notes | |
| US8607695B2 (en) | Strap driving device for a strapping machine | |
| US4406728A (en) | Apparatus for binding articles with tape | |
| CA2307395C (en) | Tensioning unit | |
| NZ239682A (en) | Strap dispenser and accumulating apparatus with pivotal strap guide | |
| JP2000255510A (en) | Binding machine using tape | |
| EP0952278A3 (en) | Safety device for a reinforcing bars binding machine | |
| JPS621882B2 (en) | ||
| US5577371A (en) | Apparatus for hooping a package | |
| US5501763A (en) | Tape joining apparatus | |
| US4795891A (en) | Card guide device | |
| CA2177802C (en) | Production of an endless band and method and banding apparatus for banding with this endless band | |
| JPS60132875A (en) | Compressed air type yarn twisting tying device | |
| US5088395A (en) | Tool for tensioning and cutting off a tape loop placed about an object | |
| US7412815B2 (en) | Welding head for a strap binding machine | |
| US5718426A (en) | Sheet feeding apparatus and method thereof | |
| JP3130762B2 (en) | Packing machine band connect unit | |
| RU2123462C1 (en) | Securities counterfoil wrapper | |
| US6499281B1 (en) | Deflecting subassembly | |
| JP2000281011A (en) | Band changeover device for band binding machine | |
| JP7416886B2 (en) | Automatic tying tool device optimized for a wide range of one-piece tie strap thicknesses | |
| JPH09295607A (en) | Automatically connecting apparatus for band |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |